14.3 m
Hyperfocal distance
7.16 m
Sharp from (focused at hyperfocal)
61 mm f/8.6
Full-frame equivalent
39°
Diagonal angle of view
Depth of field by subject distance#
40 mm at f/5.6 on APS-C (23.5×15.6 mm), circle of confusion 20 µm. “Background blur” is the size of an out-of-focus light at infinity as a percentage of frame width.
| Focus distance | Near limit | Far limit | Total DoF | Front / behind | Background blur |
|---|---|---|---|---|---|
| 30.0 cm (0.98 ft) | 29.5 cm | 30.6 cm | 1.1 cm | 49% / 51% | 4.68% |
| 50.0 cm (1.64 ft) | 48.4 cm | 51.7 cm | 3.2 cm | 48% / 52% | 2.64% |
| 75.0 cm (2.46 ft) | 71.4 cm | 78.9 cm | 7.5 cm | 48% / 52% | 1.71% |
| 1.00 m (3.28 ft) | 93.7 cm | 1.07 m | 13.5 cm | 47% / 53% | 1.27% |
| 1.50 m (4.92 ft) | 1.36 m | 1.67 m | 31.0 cm | 45% / 55% | 0.83% |
| 2.00 m (6.56 ft) | 1.76 m | 2.32 m | 55.9 cm | 43% / 57% | 0.62% |
| 3.00 m (9.84 ft) | 2.49 m | 3.78 m | 1.30 m | 40% / 60% | 0.41% |
| 4.00 m (13.1 ft) | 3.13 m | 5.53 m | 2.40 m | 36% / 64% | 0.31% |
| 5.00 m (16.4 ft) | 3.71 m | 7.66 m | 3.95 m | 33% / 67% | 0.25% |
| 7.00 m (23.0 ft) | 4.71 m | 13.7 m | 8.94 m | 26% / 74% | 0.17% |
| 10.0 m (32.8 ft) | 5.89 m | 33.0 m | 27.1 m | 15% / 85% | 0.12% |
| 15.0 m (49.2 ft) | 7.33 m | ∞ | ∞ | — | 0.08% |
| 20.0 m (65.6 ft) | 8.34 m | ∞ | ∞ | — | 0.06% |
| 30.0 m (98.4 ft) | 9.69 m | ∞ | ∞ | — | 0.04% |
| 50.0 m (164 ft) | 11.1 m | ∞ | ∞ | — | 0.02% |
| 100 m (328 ft) | 12.5 m | ∞ | ∞ | — | 0.01% |
Try other settings#
Near limit—
Far limit—
Depth of field—
Hyperfocal distance—
In front / behind—
40 mm at other apertures (subject at 3 m)#
Other focal lengths at f/5.6#
| Focal length | Subject at | Total DoF |
|---|---|---|
| 14 mm | 3.00 m | ∞ |
| 16 mm | 3.00 m | ∞ |
| 20 mm | 3.00 m | 16.5 m |
| 24 mm | 3.00 m | 5.22 m |
| 28 mm | 3.00 m | 3.11 m |
| 35 mm | 3.00 m | 1.76 m |
| 40 mm | 3.00 m | 1.30 m |
| 50 mm | 3.00 m | 80.7 cm |
| 85 mm | 3.00 m | 27.2 cm |
| 105 mm | 3.00 m | 17.7 cm |
| 135 mm | 3.00 m | 10.6 cm |
| 200 mm | 10.0 m | 54.9 cm |
| 300 mm | 10.0 m | 24.1 cm |
| 400 mm | 10.0 m | 13.4 cm |
| 600 mm | 10.0 m | 5.8 cm |
Same lens settings on other formats#
When to use it#
At f/5.6, a 40 mm lens on APS-C is a natural choice for general photography. Focused at 3 m you get 1.30 m of sharp zone; for maximum front-to-back sharpness focus at 14.3 m and everything from 7.16 m to infinity will be acceptably sharp.
See also the f/5.6 aperture guide.
Frequently asked questions#
What is the depth of field of a 40mm lens at f/5.6?
On APS-C, focused at 3 m, it is 1.30 m; at 1 m it is 13.5 cm.
What is the hyperfocal distance for 40mm f/5.6?
14.3 m (47.0 ft) on APS-C. Everything from 7.16 m to infinity is acceptably sharp.
Last updated October 03, 2026 · How we calculate · Sources